Table 2 Extracted pore shape parameters.

From: Quantitative classification evaluation model for tight sandstone reservoirs based on machine learning

Core number

Φ (%)

K (10–3 µm2)

Perimeter(µm)

Circularity

Major axis (µm)

Aspect ratio

Solidity

1

9.29

0.39

312.34

0.63

112.89

1.61

0.35

2

9.32

0.14

322.51

0.31

129.11

2.28

0.71

3

10.36

0.94

352.42

0.89

142.23

1.48

0.14

4

10.43

0.19

342.81

0.22

148.68

2.17

0.71

5

11.54

0.23

378.41

0.34

161.37

2.33

0.61

6

9.08

0.17

272.46

0.29

105.38

2.37

0.76

7

9.97

0.13

368.14

0.23

139.40

2.12

0.77

8

8.53

0.12

325.47

0.24

149.89

2.48

0.77

9

9.09

0.10

330.97

0.23

130.97

2.55

0.77

10

9.38

0.10

314.48

0.29

123.78

2.29

0.78

11

12.25

0.26

420.48

0.38

183.94

1.98

0.65

12

9.40

0.30

310.64

0.32

159.89

2.05

0.63

13

10.10

0.21

310.04

0.29

139.07

2.32

0.76

14

10.80

0.21

337.37

0.28

125.77

2.36

0.73

15

11.85

0.78

385.59

0.75

175.33

1.31

0.22

16

12.80

0.64

416.32

0.79

195.34

1.62

0.26

17

11.55

0.16

399.94

0.31

184.82

2.36

0.62

18

12.40

0.32

288.56

0.61

107.45

1.72

0.26

19

10.10

0.20

295.68

0.36

132.39

2.22

0.58

20

13.60

1.10

486.24

0.96

221.19

1.14

0.09

21

7.07

0.09

122.71

0.19

93.94

2.68

0.88

22

5.65

0.08

100.77

0.11

82.38

2.59

0.85

23

6.68

0.05

100.16

0.18

72.42

2.69

0.72

24

7.50

0.09

120.20

0.17

82.97

2.67

0.83

25

9.55

0.22

238.05

0.31

120.53

2.21

0.61

26

8.87

0.09

327.73

0.11

130.77

2.73

0.83

27

7.16

0.10

219.06

0.24

92.28

2.32

0.77

28

6.49

0.08

179.13

0.12

85.46

2.71

0.84

29

6.98

0.06

138.49

0.19

42.52

2.62

0.81

30

6.15

0.05

164.49

0.12

73.29

2.73

0.89

31

7.35

0.05

180.40

0.28

87.58

2.41

0.74

32

8.20

0.09

245.46

0.35

102.76

2.19

0.62

33

7.00

0.18

218.19

0.48

84.79

1.97

0.38

34

8.17

0.09

267.47

0.36

114.27

2.16

0.56

35

6.32

0.08

179.18

0.21

73.20

2.24

0.68

36

8.17

0.12

264.94

0.43

118.24

2.18

0.62

37

7.22

0.08

217.58

0.25

83.13

2.11

0.45

38

9.99

0.05

299.56

0.13

110.26

2.42

0.75

39

6.69

0.02

232.39

0.17

77.71

2.57

0.82

40

6.52

0.06

261.47

0.23

115.18

2.78

0.83

41

10.40

0.11

366.41

0.24

130.67

2.42

0.72

42

7.04

0.02

228.36

0.17

86.91

2.61

0.79

43

9.81

0.10

271.22

0.21

134.88

2.66

0.79

44

2.41

0.01

40.31

0.18

67.51

2.69

0.83

45

3.64

0.03

51.32

0.12

50.68

2.87

0.82

46

9.01

0.43

219.38

0.61

80.18

1.59

0.39

47

3.09

0.02

68.02

0.12

56.38

2.62

0.84

48

4.78

0.02

119.68

0.16

61.94

2.75

0.88

49

5.48

0.05

142.86

0.21

76.23

2.46

0.79

50

4.91

0.04

179.53

0.18

85.38

2.53

0.81

51

5.78

0.01

226.21

0.14

100.06

2.92

0.84

52

3.47

0.02

66.69

0.22

63.77

2.69

0.76

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